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sveta [45]
3 years ago
7

To see what parents in her neighborhood think about proposed changes to their local park, a parent walks through the neighborhoo

d one morning and questions other parents she sees in their front yards. Which type of sampling method did she use?
A.simple random sampling    B.convenience sampling C.stratified random sampling D.voluntary response sampling
Mathematics
1 answer:
Anvisha [2.4K]3 years ago
8 0
B. Convenience sampling
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What is the lowest term of 75/60 as an improper fraction?
Katena32 [7]
75/60 = 15/12 = 5/4. This is the lowest term
5 0
2 years ago
Read 2 more answers
What is the value of x is the equation 3(2x + 3) = 3x + 12 ?
Doss [256]
6x+9=3x+12
6x-3x=12-9
3x=3
X= 3
I hope this helps :)!
7 0
3 years ago
Read 2 more answers
True or False
Alja [10]

Step-by-step explanation:

Q1)

for x = 2, y = 1

-8x³y⁴/7 = -64/7

-8×2³×1⁴/7 = -8×8×1/7 = -64/7

true

Q2)

x/4 + x/6 - x/2 = 3/4

is x = -9 ?

bringing everything to 1/12 ...

3x/12 + 2x/12 - 6x/12 = 3×3/12

-x/12 = 9/12

-x = 9

x = -9

true

Q3)

can

1 - 2ab - (a² + b²) = 1 - 2ab - a² - b² be factored as

(1 + a - b)(1 + a + b)

let's multiply

(1 + a - b)(1 + a + b) =

= 1 + a + b + a + a² + ab - b - ab - b² =

= 1 + 2a + a² - b²

this is NOT the same as

1 - 2ab - a² - b²

false

Q4)

The horizontal distance of a point from the y-axis is called abscissa or x coordinate of the point.

3 is the y coordinate of (2, 3) and not the x coordinate.

false

Q5)

(7, 9) and (9, 7)

the x coordinates are different, and the y coordinate are different. so, they are definitely NOT the same point.

this would be like saying 5 hours and 3 minutes is the same as 3 hours and 5 minutes.

false

Q6)

now, this is tricky. there are 4 perfect cubes between 1 and 100 :

1×1×1 = 1

2×2×2 = 8

3×3×3 = 27

4×4×4 = 64

did your teacher mean "exactly 3 perfect cubes" ? because, since there are 4, there are also 3, of course (and 2, and 1).

and did "between 1 and 100" mean including the numbers 1 and 100, or excluding the numbers 1 and 100 ?

so, if excluding 1 and 100, then it is true.

if including 1 and 100 and asking for exactly 3, then it is false.

if including 1 and 100 and truly only asking for 3, then it is true.

Q7)

12³ = 12×12×12 = 144×12 = 1728

true

Q8)

(a+1)(a-1)(a²+1) = (a⁴ -1) ?

let's multiply

(a² + a - a - 1)(a² + 1) = (a²-1)(a²+1) = a⁴ - a² + a² - 1 = a⁴-1

true

Q9)

the areas of the 2 squares are

25a² and 25b²

the sum is

25a² + 25b² = 25(a² + b²)

but

25(a+b)(a-b) = 25(a² - b²)

this is NOT the same.

false

Q10)

abc + bca + cba

a monomial is, roughly speaking, a polynomial which has only one term.

but the given expression has 3 terms.

false

8 0
2 years ago
Please help me ASAP!!
olya-2409 [2.1K]

Answer:

17.6

Step-by-step explanation:

3 0
3 years ago
Help Evaluate when x=3.1<br> 2x + 1.5x
nexus9112 [7]

Answer:

10.85

Step-by-step explanation:

2x + 1.5x  x=3.1

simply plugg in <em>3.1 for X</em>

2 multiplied by 3.1 + 1.5 multiplied by 3.1 and you get

6.2 + 4.65 which = 10.85

5 0
3 years ago
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